Chemical pesticides are substances used to kill or control pests that harm crops, plants, and livestock. They can target insects, weeds, fungi, and other unwanted organisms. These pesticides are often synthetic, meaning they are chemically manufactured, and are designed to be effective at low concentrations. While chemical pesticides can increase agricultural productivity, they also raise concerns about environmental and health impacts. Residues may remain on food, and improper use can lead to contamination of soil and water. Regulatory agencies, such as the Environmental Protection Agency (EPA), monitor and set guidelines for their safe use to minimize risks.